子进程从终止时起就一直处于僵死状态，直到父进程确认该信号为止。
From the time the child dies until the time the parent acknowledges the signal, the child sits in a zombie state.
采用抢先调度方式时，具有最高优先级的任务先执行直到它进入等待或僵死状态，或者是有更高优先级的任务产生。
Under preemptive scheduling, the highest priority task executes until it enters the waiting or dead states or a higher priority task comes into existence.
如果子进程在父进程之前终止，则会向父进程发送一个信号，然后子进程转变为僵死状态，直到该信号得到确认，或父进程被终止。
If the child dies before the parent, a signal is sent to the parent, and then the child moves to a zombie state until the signal is acknowledged, or the parent process is killed.
如果子进程在父进程之前终止，则会向父进程发送一个信号，然后子进程转变为僵死状态，直到该信号得到确认，或父进程被终止。
If the child dies before the parent, a signal is sent to the parent, and then the child moves to a zombie state until the signal is acknowledged, or the parent process is killed.
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